Scrabble is a word game in which two to four players score points by forming words from individual lettered tiles on a game board marked with a 15-by-15 grid. The words are formed across and down in crossword fashion and must appear in a standard dictionary. Official reference works (e.g. The Official Scrabble Players Dictionary) provide a list of permissible words. The Collins Scrabble checker can also be used to check if a word is allowed.

The name Scrabble is a trademark of Hasbro, Inc. in the United States and Canada and of Mattel elsewhere. Scrabble was a trademark of Murfett Regency in Australia, until 1993 when it was acquired by J. W. Spear & Sons (now a Mattel subsidiary). The game is also known as Literati, Alfapet, Funworder, Skip-A-Cross, Scramble, Spelofun, Palabras Cruzadas ("crossed words") and Word for Word.

The game is sold in 121 countries in 29 different language versions. One hundred and fifty million sets have been sold worldwide, and sets are found in one out of every three American homes.

The game is played by two to four players on a square (or nearly square) board with a 15-by-15 grid of cells (individually known as "squares"), each of which accommodates a single letter tile. In official club and tournament games, play is always between two players (or, occasionally, between two teams each of which collaborates on a single rack).

The game contains 100 tiles, 98 of which are marked with a letter and a point value ranging from 1 to 10. The number of points of each lettered tile is based on the letter's frequency in standard English writing; commonly used letters such as E or O are worth one point, while less common letters score higher, with Q and Z each worth 10 points. The game also has two blank tiles that are unmarked and carry no point value. The blank tiles can be used as substitutes for any letter; once laid on the board, however, the choice is fixed. The board is marked with "premium" squares, which multiply the number of points awarded: dark red "triple-word" squares, pink "double-word" squares, dark blue "triple-letter" squares, and light blue "double-letter" squares. The center square (H8) is often marked with a star or logo, and counts as a double-word square.